POST UTME LASU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 2 kg moves in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle is subjected to a centripetal acceleration of 2 m/s^2, what is the magnitude of the net force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 2
A charged particle of mass 1 kg and charge 2 C is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subjected to a magnetic field of 0.5 T, what is the magnitude of the force acting on the particle?
A. 0.5 N
B. 1 N
C. 1.5 N
D. 2 N
Question 3
A 50 Hz AC voltage source has a peak voltage of 100 V. If the current is 5 A, calculate the power factor of the circuit.
A. 0.5
B. 0.7
C. 0.9
D. 0.95
Question 4
A 100 W light bulb is connected to a 220 V power source. If the resis\tance of the bulb is 200 ohms, what is the current flowing through the bulb?
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 5
A heat engine operates between two temperatures, 300 K and 400 K. If the efficiency of the engine is 30%, what is the temperature of the hot reservoir?
A. 350 K
B. 400 K
C. 450 K
D. 500 K
Question 6
A particle of mass 3 kg is moving in a straight line with a cons\tant acceleration of 2 m/s^2. If the particle starts from rest, what is its velocity after 4 seconds?
A. 4 m/s
B. 6 m/s
C. 8 m/s
D. 10 m/s
Question 7
A circuit consists of a 100 Ω resistor, a 200 Ω resistor, and a 50 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, what is the current flowing through the 50 Ω resistor?
A. 0.2 A
B. 0.4 A
C. 0.6 A
D. 0.8 A
Question 8
A block of mass 5 kg is placed on a frictionless surface and attached to a horizontal spring with a force cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 9
A particle is moving in a circular path with a radius of 2 m. If the particle completes one revolution in 4 seconds, what is the angular velocity of the particle?
A. 1.0 rad/s
B. 2.0 rad/s
C. 3.0 rad/s
D. 4.0 rad/s
Question 10
A thermodynamic system undergoes a cyclic process, where the initial and final states are identical. If the system absorbs 500 J of heat energy during the process, and the work done by the system is 200 J, what is the change in internal energy of the system?
A. -300 J
B. 300 J
C. -500 J
D. 500 J
Question 11
A 10 μF capacitor is connected in parallel with a 20 μF capacitor. If a 5 V battery is connected across the combination, what is the equivalent capaci\tance?
A. 10 μF
B. 15 μF
C. 20 μF
D. 25 μF
Question 12
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 5 V battery. If the switch is closed at time t = 0, what is the charge on the capacitor after 2 seconds?
A. 0.1 C
B. 0.2 C
C. 0.3 C
D. 0.4 C
Question 13
A simple harmonic motion has a frequency of 5 Hz and an amplitude of 0.1 m. If the initial phase angle is 30°, calculate the displacement of the particle at t = 0.1 s.
A. 0.05 m
B. 0.06 m
C. 0.07 m
D. 0.08 m
Question 14
A 2 kg block of ice at 0°C is placed in a 5°C water bath. Assuming the specific heat capacity of ice is 2090 J/(kg°C) and the latent heat of fusion of ice is 334,000 J/kg, calculate the heat energy required to melt the ice completely.
A. 2.15 x 10^5 J
B. 2.15 x 10^4 J
C. 2.15 x 10^3 J
D. 2.15 x 10^2 J
Question 15
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq

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